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hugo7
We had radon issues here (down in Devon), when we renovated we had to put down a particular type of membrane and a sump below the membrane which vents externally. However the family had been living here for 100 years beforehand with no issues, so I don't think it is a massive issue, and I think the materials cost us an extra couple of hundred quid to sort out, but can't imagine you would have to do anything retrospectively.